Hello, friends!
3 days I smoked the Internet. I ran Arduino uno + GRBL1.1 sketch + GRBL controller. Everything works, but I'm not satisfied with the level of control over the board.
I want to assemble the configuration via MODBUS. I tried to put different versions of the Modbus libraries. Configured Math3. Does not work.
I'm looking for a working Modbus library for receiving XYZ step / dir and sending button clicks in Math3.
I'm looking for a working configuration of Brain for pinout CNC Shield v3.0
Sorry for English, this is Google translator.

Hi there,

Same here. But I make Mach3 to send Spindle Start/Stop through Arduino and CNC shield on pin 12.
I can't convince MACH3 to send pulses for step / dir for x, y and z, and receive info about Resume, Hold and Abort buttons from Arduino.
I don't know how to make / configure brains for these actions.
Can anyone help us with this?

Thank's in advance.

Hi,
Modbus is a serial communication protocol, there is no way it can send accurately timed Step/Direction pulses
they are way to fast.

Craig